Hi Chris: I have just moved into a new home and it has an IM3303 intercom system in it. Everything works but the three outside speakers. There is a outdoor control station with 4 screws holding a three button and volume knob cover in it. The board inside has two wires coming off of it that were spliced into the outdoor speakers. The board says ISA Series 30 on it and also has the part # 36744-1a on it. I need to get a replacement for this outdoor control so I can get my speakers working. Can you tell me the part number or a suitable 3 wire replacement with the speaker wires on it?? Thank You Don

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